CC2 Methods of separating and purifying substances personal learning checklist

GCSE Edexcel Combined Science · Chemistry Paper 1

Name ____________________ Class __________ Date __________

Tick one box per statement. Red: need help. Amber: partly confident. Green: can do independently.

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Purity and solutions
Distinguish elements, compounds and mixtures using particle identity, bonding and composition.
Assess chemical purity using melting and boiling evidence rather than everyday labels.
Explain solute, solvent, solution and solubility and select suitable separation methods.
Plan a sequence to separate a mixture of soluble and insoluble solids.
Filtration and crystallisation
Explain filtration using residue and filtrate and why dissolved substances pass through.
Describe crystallisation, washing and drying while avoiding loss or damage to crystals.
Distillation
Explain simple distillation and the roles of the thermometer and cooled condenser.
Describe safe distillation setup, including condenser water flow and suitable heating.
Explain fractional distillation as repeated evaporation and condensation separating miscible liquids.
Chromatography
Describe paper chromatography using a pencil baseline, controlled solvent level and marked solvent front.
Explain separation through different interactions with the mobile and stationary phases.
Calculate Rf from baseline measurements and use appropriate unit-free values.
Interpret chromatograms to compare dyes and assess mixtures and purity with appropriate caution.
Water treatment
Explain sedimentation, filtration and chlorination when producing potable freshwater.
Explain desalination by distillation and the need for salt-free water in chemical analysis.

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